I have not received my Pi4 yet
so I am not 100% sure but the reason I recently rebuilt a new image is so we could support it. Buster is "supposed" to be adjusted for the new Pi4.
I am not sure we will ever ship any from what I have read it is a more powerful computer but at the cost of more power consumption and heat production
Not optimal IMHO for an Alarm Appliance. More reason the new AD2 Pi pHat needs my attention to get into production. August will be busy.
Best
Seam M